Allendale County, South Carolina
4 ZIP codes · Avg score 87/100 · Grade A · Updated 2026-06-04
Although county size varies, Allendale County's 4 ZIP codes share reliably safe tap water records and above-average compliance scores.
How Allendale County Compares
How Allendale County Compares
Allendale County scores 9 points above the South Carolina state average (78/100) and 19 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
Key Risk Factors
Health risk index: 17.5 (asthma 11%, diabetes 21.6%)
Estimated additional annual cost per homeowner: $3,445, driven primarily by sea_level
Infrastructure: 0.317% avg pipe failure probability
59.7% of homes built before 1978 (lead paint era)
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $3,445
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
3,895 housing units in Allendale County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Allendale County
Water safety remediation is a moderate expense relative to home values. Most homeowners can address issues through staged improvements over time.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Allendale County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 4 systems in Allendale County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Allendale Town of (sc0310001) | 3,882 | 8 |
| 2 | Allendale Industrial Park (sc0320002) | 2,694 | 8 |
| 3 | Fairfax Town of (sc0310004) | 1,962 | 5 |
| 4 | ULMER TOWN OF (SC0310002) | 245 | 0 |
All ZIP Codes in Allendale County
4 ZIP codes tracked in Allendale County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 29849 | Ulmer | 99 | A | 0 | $154K |
| 2 | 29810 | Allendale | 94 | A | 3 | $66K |
| 3 | 29827 | Fairfax | 88 | A | 5 | $60K |
| 4 | 29846 | Sycamore | 66 | C | 0 | — |
Recommended Buyer Guides for Allendale County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 59.7% of homes built before 1978
Overview
Allendale County in South Carolina covers 4 ZIP codes with an average Home Safety Score of A (87/100).
2 of 4 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to South Carolina water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.